Cipher Machine Challenges

Presentation

A few years ago I created a cryptographic challenge that
allows hobbyists to try to decrypt messages encrypted by
the M-209 encryption machine. George Lasry won the challenge
in early 2017.

This page presents other Challenges (but I left links on
my M-209 Challenge). At this time, there
are few problems. I will add more in the coming months.

My favorite subjects are the encryption machines used before
or during the Second World War. There are several types of
problems. The simplest requires only knowing well the machine
used. Some problems are simple fun puzzles (I hope!).
Others problems require knowledge of the known
decryption methods. Finally few problems have no obvious
solutions. Finding their solution can advance the cryptographic
science. You can suggest problems too. Perhaps I will add them
to my challenges.

If you want to participate to my Challenges you send me your
solution for each problem by
email.
Please, put the following
text in the subject line: "The name of the Cipher Machine -
Solution - Problem Number". For example
"Kryha - Solution - 2nd problem".

The first time you send me any solution, give me your name (or
nickname) and your country.